Search Results: Subbasis

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Subbase
Sabtu, 2026-07-11 04:34:23

In topology in mathematics, a subbase (or subbasis, prebase, prebasis) for the topology τ of a topological space (X, τ) is a subcollection B {\displaystyle...

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Supercompact space
Sabtu, 2025-11-22 19:12:03

there is a subbasis such that every open cover of the topological space from elements of the subbasis has a subcover with at most two subbasis elements...

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Neighbourhood system
Rabu, 2026-06-17 16:07:38

is the superset relation and not the subset relation). A neighbourhood subbasis at x {\displaystyle x} is a family S {\displaystyle {\mathcal {S}}} of...

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Ordered field
Selasa, 2026-01-20 06:23:18

{ P ∈ X F : a ∈ P } {\displaystyle H(a)=\{P\in X_{F}:a\in P\}} form a subbasis for the Harrison topology. The product is a Boolean space (compact, Hausdorff...

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Locally convex topological vector space
Selasa, 2026-06-16 14:16:43

{P}}} and r {\displaystyle r} ranges over the positive real numbers is a subbasis at the origin for the topology induced by P {\displaystyle {\mathcal {P}}}...

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List of topologies
Senin, 2026-06-22 07:22:15

extension topology on X {\displaystyle X} is the topology having as a subbasis the union of τ and the family of all subsets of X {\displaystyle X} whose...

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Lawson topology
Selasa, 2024-12-31 04:32:35

of domain theory. The lower topology on a poset P is generated by the subbasis consisting of all complements of principal filters on P. The Lawson topology...

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Priestley space
Kamis, 2026-02-19 16:13:57

clopen down-sets of X. (d) Clopen up-sets and clopen down-sets of X form a subbasis for (X,τ). (e) For each pair of closed subsets F and G of X, if ↑F ∩ ↓G...

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Finite intersection property
Rabu, 2026-07-08 03:58:13

proper filter has the finite intersection property. Every neighbourhood subbasis at a point in a topological space has the FIP, and the same is true of...

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Topological vector space
Sabtu, 2026-05-30 15:34:59

define a vector topology it suffices to define a neighborhood basis (or subbasis) for it at the origin. Theorem (Neighborhood filter of the origin)—Suppose...

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Ziegler spectrum
Senin, 2022-09-19 11:38:07

\operatorname {pinj} _{R}\mid \varphi (N)\supsetneq \psi (N)\cap \varphi (N)\}} as subbasis of open sets, where φ , ψ {\displaystyle \varphi ,\psi } range over (right)...

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List of general topology topics
Senin, 2026-01-05 03:44:02

Homeomorphism Local homeomorphism Open and closed maps Embedding Germ Basis Subbasis Open cover Locally finite space Covering space Atlas Limit point Net Filter...

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Alexander's subbase lemma
Jumat, 2026-04-24 11:17:29

X , {\displaystyle U\neq X,} and S {\displaystyle {\mathcal {S}}} is a subbasis generating X {\displaystyle X} 's topology (together with X {\displaystyle...

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Polar topology
Minggu, 2026-03-01 17:07:50

\left\{rG^{\circ }~:~G\in {\mathcal {G}},r>0\right\}} forms a neighbourhood subbasis at the origin. When Y {\displaystyle Y} is endowed with this G {\displaystyle...

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Glossary of general topology
Jumat, 2026-06-05 12:53:02

term weaker topology. Subbase A collection of open sets is a subbase (or subbasis) for a topology if every non-empty proper open set in the topology is the...

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Dual system
Kamis, 2026-04-16 11:22:38

{\displaystyle \left\{rG^{\circ }:G\in {\mathcal {G}},r>0\right\}} forms a subbasis of neighborhoods at the origin. When Y {\displaystyle Y} is endowed with...

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Dhakaiyas
Sabtu, 2026-04-11 13:52:34

khoshbas meaning happily-settled. Other names for them included sukhbas and subbasi. Originally an Urdu-speaking community, their time in Bengal led to the...

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